1// -*- C++ -*-
  2#include "Rivet/Analysis.hh"
  3#include "Rivet/Projections/FinalState.hh"
  4#include "Rivet/Projections/UnstableParticles.hh"
  5
  6namespace Rivet {
  7
  8
  9  /// @brief e+ e- > pi+ pi- pi0 chi_b
 10  class BELLE_2014_I1309588 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2014_I1309588);
 15
 16
 17    /// @name Analysis methods
 18    /// @{
 19
 20    /// Book histograms and initialise projections before the run
 21    void init() {
 22      // projections
 23      declare(FinalState(), "FS");
 24      declare(UnstableParticles(), "UFS");
 25      for (unsigned int ix=0; ix<3; ++ix) {
 26        for (unsigned int iy=0;iy<2;++iy) {
 27          book(_h[ix][iy],1+ix,1,1+iy);
 28        }
 29      }
 30    }
 31
 32    void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
 33      for (const Particle &child : p.children()) {
 34        if (child.children().empty()) {
 35          --nRes[child.pid()];
 36          --ncount;
 37        }
 38        else {
 39          findChildren(child,nRes,ncount);
 40        }
 41      }
 42    }
 43
 44
 45    /// Perform the per-event analysis
 46    void analyze(const Event& event) {
 47      const FinalState& fs = apply<FinalState>(event, "FS");
 48      map<long,int> nCount;
 49      int ntotal(0);
 50      for (const Particle& p: fs.particles()) {
 51      	nCount[p.pid()] += 1;
 52      	++ntotal;
 53      }
 54      const FinalState& ufs = apply<FinalState>(event, "UFS");
 55      // loop over any chi mesons
 56      for (const Particle & chi : ufs.particles(Cuts::pid==20553 || Cuts::pid==555)) {
 57        if (chi.children().empty()) continue;
 58        map<long,int> nRes = nCount;
 59        int ncount = ntotal;
 60        findChildren(chi,nRes,ncount);
 61        // first check for 3 pi chi_b
 62        bool matched3Pi = false;
 63        if (ncount==3) {
 64          matched3Pi = true;
 65          for (const auto& val : nRes) {
 66            if (abs(val.first)==PID::PIPLUS || val.first==PID::PI0) {
 67              if (val.second!=1) {
 68                matched3Pi = false;
 69                break;
 70              }
 71            }
 72            else if (val.second!=0) {
 73              matched3Pi = false;
 74              break;
 75            }
 76          }
 77        }
 78        // then for omega chi_b
 79        bool matchedOmega = false;
 80        for(const Particle & omega : ufs.particles(Cuts::pid==223)) {
 81          Particle parent = omega;
 82          while (!parent.parents().empty()) {
 83            parent = parent.parents()[0];
 84            if (parent.pid()==555 || parent.pid()==20553) break;
 85          }
 86          if ((parent.pid()==555 || parent.pid()==20553) &&
 87               fuzzyEquals(parent.momentum(),chi.momentum())) continue;
 88       	  map<long,int> nRes2 = nRes;
 89       	  int ncount2 = ncount;
 90       	  findChildren(omega,nRes2,ncount2);
 91       	  matchedOmega = true;
 92       	  for(const auto& val : nRes2) {
 93       	    if (val.second!=0) {
 94       	      matchedOmega = false;
 95       	      break;
 96       	    }
 97       	  }
 98          if (matchedOmega) break;
 99        }
100        if (!matched3Pi && !matchedOmega) continue;
101        unsigned int iloc= chi.pid()==20553 ? 0 : 1;
102        if (matched3Pi) {
103          _h[0][iloc]->fill("10.867"s);
104        }
105        if (matchedOmega) {
106          _h[1][iloc]->fill("10.867"s);
107        }
108        if (matched3Pi && !matchedOmega) {
109          _h[2][iloc]->fill("10.867"s);
110        }
111        break;
112      }
113    }
114
115    /// Normalise histograms etc., after the run
116    void finalize() {
117      for (unsigned int ix=0; ix<3; ++ix) {
118        scale(_h[ix], crossSection()/ sumOfWeights() /picobarn);
119      }
120    }
121
122    /// @}
123
124
125    /// @name Histograms
126    /// @{
127    BinnedHistoPtr<string> _h[3][2];
128    /// @}
129
130
131  };
132
133
134  RIVET_DECLARE_PLUGIN(BELLE_2014_I1309588);
135
136}